If you want high fidelity sounds of a Sky Crane chopper or of a RV8, consider the latest Sonic Solutions soundsets.
Full press release : “Sonic Solutions has released two new sound packs for FSX SP2/Acc in the last few weeks. One being a helicopter sound pack. This is their first helicopter sound pack for FSX and with the blessing of Nemeth Designs, this sound pack is for the Erickson S-64E Air Crane & Sikorsky CH54A Tarhe. This audio addition brings to life through sound the power of this heavy twin engine lifter. Multiple layers of sound cones ensures a dynamic ever changing experience with realistic sounds at any distance. Edited and Mixed in 24bit at 48k and properly mastered down to 16bit 48k gives you clean, punchy sounds.
Recorded in 2009 in Morinville, Alberta, Canada the RV8 sound pack faithfully recreates the Vans spirit through sound. Every nuance is captured including exterior and interior audio, flaps, randomizing wheel touches, crashes and splashes, wing scrapes, gyro, start up and shut down sequences. All true to life.
Features Include: Recorded from the actual aircraft with a IO-360 Lycoming 200 hp engine, 16bit/48k sound quality, Extensive use of multiple layers and 3D sound cones, Interior and exterior start, non combustion, all rpm ranges, prop, flaps, gyro, randomizing crashes, water crashes and wheel touches, prop buzz, canopy open and close, over speed, stall, AI sounds for multiplayer, Superb and professional mixing and implementation means very smooth transitions between start up, all rpm ranges through to shut down.”